Cummins ISB4.5 CM2150 Fault Code: 554 PID: SPN: 157 FMI: 2 Injector Metering Rail 1 Pressure – Data Erratic, Intermittent, or Incorrect.

Circuit Description
The fuel pressure sensor contains supply, signal, and return pins. The engine control module (ECM) provides 5 volt to the fuel pressure sensor. This 5 volts power supply is a shared supply. Other sensors on this circuit are the intake manifold temperature/pressure sensor, barometric air pressure sensor, and the backup engine position sensor.

Component Location
The fuel pressure sensor is located in the rail fuel on the air intake side of the engine.

Conditions for Running the Diagnostics
This diagnostic runs continuously when the engine is running.

Conditions for Setting the Fault Codes
The ECM detects that the fuel rail pressure reading is not changing with engine operating conditions.

Action Taken When the Fault Code is Active
The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails. Power derate could occur on some engines. A default value for the fuel rail pressure reading is used.

Conditions for Clearing the Fault Code
-To validate the repair, start the engine and let it idle for 1 minute.
-The ECM will turn off the amber CHECK ENGINE light and the fault code will go inactive immediately after the diagnostic runs and passes
-This fault code can also be cleared with INSITE™ electronic service tool.

Shop Talk
This fault code can become active any time the engine is loaded and the ECM detects the fuel pressure in the rail fuel is not changing. This fault code will become inactive when the ECM is powered down or if the ECM detects that the engine is loaded and the fuel pressure is changing normally. If there are many inactive counts of this fault code or if the fault is not repeatable, look for signs of tampering to the fuel pressure sensor circuit.

If the fault code occurs intermittently (can not be reproduced during a road test), then inspect each of the following for poor connections or damage:

-Intake manifold temperature/pressure sensor
-Backup engine position sensor
-Fuel pressure sensor
-Barometric air pressure sensor.